mariadb/sql/log_event.cc

/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


#ifndef MYSQL_CLIENT
#ifdef __GNUC__
#pragma implementation				// gcc: Class implementation
#endif
#include  "mysql_priv.h"
#include "slave.h"
#include <my_dir.h>
#endif /* MYSQL_CLIENT */

#ifdef MYSQL_CLIENT
static void pretty_print_str(FILE* file, char* str, int len)
{
  char* end = str + len;
  fputc('\'', file);
  while (str < end)
  {
    char c;
    switch ((c=*str++)) {
    case '\n': fprintf(file, "\\n"); break;
    case '\r': fprintf(file, "\\r"); break;
    case '\\': fprintf(file, "\\\\"); break;
    case '\b': fprintf(file, "\\b"); break;
    case '\t': fprintf(file, "\\t"); break;
    case '\'': fprintf(file, "\\'"); break;
    case 0   : fprintf(file, "\\0"); break;
    default:
      fputc(c, file);
      break;
    }
  }
  fputc('\'', file);
}
#endif

#ifndef MYSQL_CLIENT


static void pretty_print_str(String* packet, char* str, int len)
{
  char* end = str + len;
  packet->append('\'');
  while (str < end)
  {
    char c;
    switch((c=*str++)) {
    case '\n': packet->append( "\\n"); break;
    case '\r': packet->append( "\\r"); break;
    case '\\': packet->append( "\\\\"); break;
    case '\b': packet->append( "\\b"); break;
    case '\t': packet->append( "\\t"); break;
    case '\'': packet->append( "\\'"); break;
    case 0   : packet->append( "\\0"); break;
    default:
      packet->append((char)c);
      break;
    }
  }
  packet->append('\'');
}

static inline char* slave_load_file_stem(char*buf, uint file_id,
					 int event_server_id)
{
  fn_format(buf,"SQL_LOAD-",slave_load_tmpdir,"",4+32);
  buf = strend(buf);
  buf = int10_to_str(::server_id, buf, 10);
  *buf++ = '-';
  buf = int10_to_str(event_server_id, buf, 10);
  *buf++ = '-';
  return int10_to_str(file_id, buf, 10);
}

#endif

const char* Log_event::get_type_str()
{
  switch(get_type_code())
  {
  case START_EVENT:  return "Start";
  case STOP_EVENT:   return "Stop";
  case QUERY_EVENT:  return "Query";
  case ROTATE_EVENT: return "Rotate";
  case INTVAR_EVENT: return "Intvar";
  case LOAD_EVENT:   return "Load";
  case NEW_LOAD_EVENT:   return "New_load";
  case SLAVE_EVENT:  return "Slave";
  case CREATE_FILE_EVENT: return "Create_file";
  case APPEND_BLOCK_EVENT: return "Append_block";
  case DELETE_FILE_EVENT: return "Delete_file";
  case EXEC_LOAD_EVENT: return "Exec_load";
  default: /* impossible */ return "Unknown";
  }
}

#ifndef MYSQL_CLIENT
Log_event::Log_event(THD* thd_arg, uint16 flags_arg):
    exec_time(0),
    flags(flags_arg),cached_event_len(0),
    temp_buf(0),thd(thd_arg)
{
  if (thd)
  {
    server_id = thd->server_id;
    log_seq = thd->log_seq;
    when = thd->start_time;
  }
  else
  {
    server_id = ::server_id;
    log_seq = 0;
    when = time(NULL);
  }
}

static void cleanup_load_tmpdir()
{
  MY_DIR *dirp;
  FILEINFO *file;
  uint i;
  if (!(dirp=my_dir(slave_load_tmpdir,MYF(MY_WME))))
    return;

  for (i=0;i<(uint)dirp->number_off_files;i++)
  {
    file=dirp->dir_entry+i;
    if (!memcmp(file->name,"SQL_LOAD-",9))
      my_delete(file->name,MYF(MY_WME));
  }

  my_dirend(dirp);
}

#endif

Log_event::Log_event(const char* buf):cached_event_len(0),temp_buf(0)
{
  when = uint4korr(buf);
  server_id = uint4korr(buf + SERVER_ID_OFFSET);
  log_seq = uint4korr(buf + LOG_SEQ_OFFSET);
  flags = uint2korr(buf + FLAGS_OFFSET);
#ifndef MYSQL_CLIENT
  thd = 0;
#endif  
}


#ifndef MYSQL_CLIENT

int Log_event::exec_event(struct st_master_info* mi)
{
  if (mi)
  {
    thd->log_seq = 0;
    mi->inc_pos(get_event_len(), log_seq);
    flush_master_info(mi);
  }
  return 0;
}

void Log_event::pack_info(String* packet)
{
  net_store_data(packet, "", 0);
}

void Query_log_event::pack_info(String* packet)
{
  char buf[256];
  String tmp(buf, sizeof(buf));
  tmp.length(0);
  if(db && db_len)
  {
   tmp.append("use ");
   tmp.append(db, db_len);
   tmp.append("; ", 2);
  }

  if(query && q_len)
    tmp.append(query, q_len);
  net_store_data(packet, (char*)tmp.ptr(), tmp.length());
}

void Start_log_event::pack_info(String* packet)
{
  char buf1[256];
  String tmp(buf1, sizeof(buf1));
  tmp.length(0);
  char buf[22];

  tmp.append("Server ver: ");
  tmp.append(server_version);
  tmp.append(", Binlog ver: ");
  tmp.append(llstr(binlog_version, buf));
  net_store_data(packet, tmp.ptr(), tmp.length());
}

void Load_log_event::pack_info(String* packet)
{
  char buf[256];
  String tmp(buf, sizeof(buf));
  tmp.length(0);
  if(db && db_len)
  {
   tmp.append("use ");
   tmp.append(db, db_len);
   tmp.append("; ", 2);
  }

  tmp.append("LOAD DATA INFILE '");
  tmp.append(fname, fname_len);
  tmp.append("' ", 2);
  if(sql_ex.opt_flags && REPLACE_FLAG )
    tmp.append(" REPLACE ");
  else if(sql_ex.opt_flags && IGNORE_FLAG )
    tmp.append(" IGNORE ");
  
  tmp.append("INTO TABLE ");
  tmp.append(table_name);
  if (sql_ex.field_term_len)
  {
    tmp.append(" FIELDS TERMINATED BY ");
    pretty_print_str(&tmp, sql_ex.field_term, sql_ex.field_term_len);
  }

  if (sql_ex.enclosed_len)
  {
    if (sql_ex.opt_flags && OPT_ENCLOSED_FLAG )
      tmp.append(" OPTIONALLY ");
    tmp.append( " ENCLOSED BY ");
    pretty_print_str(&tmp, sql_ex.enclosed, sql_ex.enclosed_len);
  }
     
  if (sql_ex.escaped_len)
  {
    tmp.append( " ESCAPED BY ");
    pretty_print_str(&tmp, sql_ex.escaped, sql_ex.escaped_len);
  }
     
  if (sql_ex.line_term_len)
  {
    tmp.append(" LINES TERMINATED BY ");
    pretty_print_str(&tmp, sql_ex.line_term, sql_ex.line_term_len);
  }

  if (sql_ex.line_start_len)
  {
    tmp.append(" LINES STARTING BY ");
    pretty_print_str(&tmp, sql_ex.line_start, sql_ex.line_start_len);
  }
     
  if ((int)skip_lines > 0)
    tmp.append( " IGNORE %ld LINES ", (long) skip_lines);

  if (num_fields)
  {
    uint i;
    const char* field = fields;
    tmp.append(" (");
    for(i = 0; i < num_fields; i++)
    {
      if(i)
	tmp.append(" ,");
      tmp.append( field);
	  
      field += field_lens[i]  + 1;
    }
    tmp.append(')');
  }

  net_store_data(packet, tmp.ptr(), tmp.length());
}

void Rotate_log_event::pack_info(String* packet)
{
  char buf1[256];
  String tmp(buf1, sizeof(buf1));
  tmp.length(0);
  char buf[22];
  tmp.append(new_log_ident, ident_len);
  tmp.append(";pos=");
  tmp.append(llstr(pos,buf));
  if(flags & LOG_EVENT_FORCED_ROTATE_F)
    tmp.append("; forced by master");
  net_store_data(packet, tmp.ptr(), tmp.length());
}

void Intvar_log_event::pack_info(String* packet)
{
  char buf1[256];
  String tmp(buf1, sizeof(buf1));
  tmp.length(0);
  char buf[22];
  tmp.append(get_var_type_name());
  tmp.append('=');
  tmp.append(llstr(val, buf));
  net_store_data(packet, tmp.ptr(), tmp.length());
}

void Slave_log_event::pack_info(String* packet)
{
  char buf1[256];
  String tmp(buf1, sizeof(buf1));
  tmp.length(0);
  char buf[22];
  tmp.append("host=");
  tmp.append(master_host);
  tmp.append(",port=");
  tmp.append(llstr(master_port,buf));
  tmp.append(",log=");
  tmp.append(master_log);
  tmp.append(",pos=");
  tmp.append(llstr(master_pos,buf));
  net_store_data(packet, tmp.ptr(), tmp.length());
}


void Log_event::init_show_field_list(List<Item>* field_list)
{
  field_list->push_back(new Item_empty_string("Log_name", 20));
  field_list->push_back(new Item_empty_string("Pos", 20));
  field_list->push_back(new Item_empty_string("Event_type", 20));
  field_list->push_back(new Item_empty_string("Server_id", 20));
  field_list->push_back(new Item_empty_string("Log_seq", 20));
  field_list->push_back(new Item_empty_string("Info", 20));
}

int Log_event::net_send(THD* thd, const char* log_name, my_off_t pos)
{
  String* packet = &thd->packet;
  const char* p = strrchr(log_name, FN_LIBCHAR);
  const char* event_type;
  if (p)
    log_name = p + 1;
  
  packet->length(0);
  net_store_data(packet, log_name, strlen(log_name));
  net_store_data(packet, (longlong) pos);
  event_type = get_type_str();
  net_store_data(packet, event_type, strlen(event_type));
  net_store_data(packet, server_id);
  net_store_data(packet, log_seq);
  pack_info(packet);
  return my_net_write(&thd->net, (char*)packet->ptr(), packet->length());
}

#endif

int Query_log_event::write(IO_CACHE* file)
{
  return query ? Log_event::write(file) : -1; 
}

int Log_event::write(IO_CACHE* file)
{
  return (write_header(file) || write_data(file)) ? -1 : 0;
}

int Log_event::write_header(IO_CACHE* file)
{
  char buf[LOG_EVENT_HEADER_LEN];
  char* pos = buf;
  int4store(pos, (ulong) when); // timestamp
  pos += 4;
  *pos++ = get_type_code(); // event type code
  int4store(pos, server_id);
  pos += 4;
  long tmp=get_data_size() + LOG_EVENT_HEADER_LEN;
  int4store(pos, tmp);
  pos += 4;
  int4store(pos, log_seq);
  pos += 4;
  int2store(pos, flags);
  pos += 2;
  return (my_b_write(file, (byte*) buf, (uint) (pos - buf)));
}

#ifndef MYSQL_CLIENT

int Log_event::read_log_event(IO_CACHE* file, String* packet,
			      pthread_mutex_t* log_lock)
{
  ulong data_len;
  char buf[LOG_EVENT_HEADER_LEN];
  if (log_lock)
    pthread_mutex_lock(log_lock);
  if (my_b_read(file, (byte*) buf, sizeof(buf)))
  {
    if (log_lock) pthread_mutex_unlock(log_lock);
    // if the read hits eof, we must report it as eof
    // so the caller will know it can go into cond_wait to be woken up
    // on the next update to the log
    if(!file->error) return LOG_READ_EOF;
    return file->error > 0 ? LOG_READ_TRUNC: LOG_READ_IO;
  }
  data_len = uint4korr(buf + EVENT_LEN_OFFSET);
  if (data_len < LOG_EVENT_HEADER_LEN || data_len > max_allowed_packet)
  {
    if (log_lock) pthread_mutex_unlock(log_lock);
    return (data_len < LOG_EVENT_HEADER_LEN) ? LOG_READ_BOGUS :
      LOG_READ_TOO_LARGE;
  }
  packet->append(buf, sizeof(buf));
  data_len -= LOG_EVENT_HEADER_LEN;
  if (data_len)
  {
    if (packet->append(file, data_len))
    {
      if(log_lock)
	pthread_mutex_unlock(log_lock);
      // here we should never hit eof in a non-error condtion
      // eof means we are reading the event partially, which should
      // never happen
      return file->error >= 0 ? LOG_READ_TRUNC: LOG_READ_IO;
    }
  }
  if (log_lock) pthread_mutex_unlock(log_lock);
  return 0;
}

#endif // MYSQL_CLIENT

#ifndef MYSQL_CLIENT
#define UNLOCK_MUTEX if(log_lock) pthread_mutex_unlock(log_lock);
#else
#define UNLOCK_MUTEX
#endif

// allocates memory - the caller is responsible for clean-up
#ifndef MYSQL_CLIENT
Log_event* Log_event::read_log_event(IO_CACHE* file, pthread_mutex_t* log_lock)
#else
Log_event* Log_event::read_log_event(IO_CACHE* file)
#endif  
{
  char head[LOG_EVENT_HEADER_LEN];
#ifndef MYSQL_CLIENT 
 if(log_lock) pthread_mutex_lock(log_lock);
#endif
  if (my_b_read(file, (byte *) head, sizeof(head)))
  {
    UNLOCK_MUTEX;
    return 0;
  }

  uint data_len = uint4korr(head + EVENT_LEN_OFFSET);
  char* buf = 0;
  const char* error = 0;
  Log_event* res =  0;

  if (data_len > max_allowed_packet)
  {
    error = "Event too big";
    goto err;
  }

  if (data_len < LOG_EVENT_HEADER_LEN)
  {
    error = "Event too small";
    goto err;
  }

  // some events use the extra byte to null-terminate strings
  if (!(buf = my_malloc(data_len+1, MYF(MY_WME))))
  {
    error = "Out of memory";
    goto err;
  }
  buf[data_len] = 0;
  memcpy(buf, head, LOG_EVENT_HEADER_LEN);
  if(my_b_read(file, (byte*) buf + LOG_EVENT_HEADER_LEN,
	       data_len - LOG_EVENT_HEADER_LEN))
  {
    error = "read error";
    goto err;
  }
  if ((res = read_log_event(buf, data_len, &error)))
    res->register_temp_buf(buf);
err:
  UNLOCK_MUTEX;
  if(error)
  {
    sql_print_error(error);
    my_free(buf, MYF(MY_ALLOW_ZERO_PTR));
  }
  return res;
}

Log_event* Log_event::read_log_event(const char* buf, int event_len,
				     const char **error)
{
  if (event_len < EVENT_LEN_OFFSET ||
      (uint)event_len != uint4korr(buf+EVENT_LEN_OFFSET))
    return NULL; // general sanity check - will fail on a partial read
  
  Log_event* ev = NULL;
  
  switch(buf[EVENT_TYPE_OFFSET])
  {
  case QUERY_EVENT:
    ev  = new Query_log_event(buf, event_len);
    break;
  case LOAD_EVENT:
  case NEW_LOAD_EVENT:
    ev = new Load_log_event(buf, event_len);
    break;
  case ROTATE_EVENT:
    ev = new Rotate_log_event(buf, event_len);
    break;
  case SLAVE_EVENT:
    ev = new Slave_log_event(buf, event_len);
    break;
  case CREATE_FILE_EVENT:
    ev = new Create_file_log_event(buf, event_len);
    break;
  case APPEND_BLOCK_EVENT:
    ev = new Append_block_log_event(buf, event_len);
    break;
  case DELETE_FILE_EVENT:
    ev = new Delete_file_log_event(buf, event_len);
    break;
  case EXEC_LOAD_EVENT:
    ev = new Execute_load_log_event(buf, event_len);
    break;
  case START_EVENT:
    ev = new Start_log_event(buf);
    break;
  case STOP_EVENT:
    ev = new Stop_log_event(buf);
    break;
  case INTVAR_EVENT:
    ev = new Intvar_log_event(buf);
    break;
  default:
    break;
  }
  if (!ev) return 0;
  if (!ev->is_valid())
  {
    *error= "Found invalid event in binary log";
    delete ev;
    return 0;
  }
  ev->cached_event_len = event_len;
  return ev;  
}

#ifdef MYSQL_CLIENT
void Log_event::print_header(FILE* file)
{
  fputc('#', file);
  print_timestamp(file);
  fprintf(file, " server id  %d ", server_id); 
}

void Log_event::print_timestamp(FILE* file, time_t* ts)
{
#ifdef MYSQL_SERVER
  struct tm tm_tmp;
#endif
  struct tm *res;
  if (!ts)
  {
    ts = &when;
  }
#ifdef MYSQL_SERVER
  localtime_r(ts,(res= &tm_tmp));
#else
  res=localtime(ts);
#endif

  fprintf(file,"%02d%02d%02d %2d:%02d:%02d",
	  res->tm_year % 100,
	  res->tm_mon+1,
	  res->tm_mday,
	  res->tm_hour,
	  res->tm_min,
	  res->tm_sec);
}


void Start_log_event::print(FILE* file, bool short_form, char* last_db)
{
  if (short_form)
    return;

  print_header(file);
  fprintf(file, "\tStart: binlog v %d, server v %s created ", binlog_version,
	  server_version);
  print_timestamp(file, (time_t*)&created);
  fputc('\n', file);
  fflush(file);
}

void Stop_log_event::print(FILE* file, bool short_form, char* last_db)
{
  if (short_form)
    return;

  print_header(file);
  fprintf(file, "\tStop\n");
  fflush(file);
}

void Rotate_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char buf[22];
  if (short_form)
    return;

  print_header(file);
  fprintf(file, "\tRotate to ");
  if (new_log_ident)
    my_fwrite(file, (byte*) new_log_ident, (uint)ident_len, 
	      MYF(MY_NABP | MY_WME));
  fprintf(file, "pos=%s\n", llstr(pos, buf));
  fflush(file);
}

#endif /* #ifdef MYSQL_CLIENT */

Start_log_event::Start_log_event(const char* buf) :Log_event(buf)
{
  binlog_version = uint2korr(buf + LOG_EVENT_HEADER_LEN +
			     ST_BINLOG_VER_OFFSET);
  memcpy(server_version, buf + ST_SERVER_VER_OFFSET + LOG_EVENT_HEADER_LEN,
	 ST_SERVER_VER_LEN);
  created = uint4korr(buf + ST_CREATED_OFFSET + LOG_EVENT_HEADER_LEN);
}

int Start_log_event::write_data(IO_CACHE* file)
{
  char buff[START_HEADER_LEN];
  int2store(buff + ST_BINLOG_VER_OFFSET,binlog_version);
  memcpy(buff + ST_SERVER_VER_OFFSET,server_version,ST_SERVER_VER_LEN);
  int4store(buff + ST_CREATED_OFFSET,created);
  return (my_b_write(file, (byte*) buff, sizeof(buff)) ? -1 : 0);
}

Rotate_log_event::Rotate_log_event(const char* buf, int event_len):
  Log_event(buf),new_log_ident(NULL),alloced(0)
{
  // the caller will ensure that event_len is what we have at
  // EVENT_LEN_OFFSET
  if(event_len < ROTATE_EVENT_OVERHEAD)
    return;

  pos = uint8korr(buf + R_POS_OFFSET + LOG_EVENT_HEADER_LEN);
  ident_len = (uchar)(event_len - ROTATE_EVENT_OVERHEAD);
  if (!(new_log_ident = (char*) my_memdup((byte*) buf + R_IDENT_OFFSET
					  + LOG_EVENT_HEADER_LEN,
					  (uint) ident_len, MYF(MY_WME))))
    return;

  alloced = 1;
}

int Rotate_log_event::write_data(IO_CACHE* file)
{
  char buf[ROTATE_HEADER_LEN];
  int8store(buf, pos + R_POS_OFFSET);
  return my_b_write(file, (byte*)buf, ROTATE_HEADER_LEN) ||
    my_b_write(file, (byte*)new_log_ident, (uint) ident_len);
}

#ifndef MYSQL_CLIENT
Query_log_event::Query_log_event(THD* thd_arg, const char* query_arg,
				 bool using_trans):
    Log_event(thd_arg), data_buf(0), query(query_arg),  db(thd_arg->db),
    q_len(thd_arg->query_length),
    error_code(thd_arg->killed ? ER_SERVER_SHUTDOWN: thd_arg->net.last_errno),
    thread_id(thd_arg->thread_id), 
    cache_stmt(using_trans &&
	       (thd_arg->options & (OPTION_NOT_AUTO_COMMIT | OPTION_BEGIN)))
  {
    time_t end_time;
    time(&end_time);
    exec_time = (ulong) (end_time  - thd->start_time);
    db_len = (db) ? (uint32) strlen(db) : 0;
  }
#endif

Query_log_event::Query_log_event(const char* buf, int event_len):
  Log_event(buf),data_buf(0), query(NULL), db(NULL)
{
  if ((uint)event_len < QUERY_EVENT_OVERHEAD)
    return;				
  ulong data_len;
  data_len = event_len - QUERY_EVENT_OVERHEAD;
 

  exec_time = uint4korr(buf + LOG_EVENT_HEADER_LEN + Q_EXEC_TIME_OFFSET);
  error_code = uint2korr(buf + LOG_EVENT_HEADER_LEN + Q_ERR_CODE_OFFSET);

  if (!(data_buf = (char*) my_malloc(data_len + 1, MYF(MY_WME))))
    return;

  memcpy(data_buf, buf + LOG_EVENT_HEADER_LEN + Q_DATA_OFFSET, data_len);
  thread_id = uint4korr(buf + LOG_EVENT_HEADER_LEN + Q_THREAD_ID_OFFSET);
  db = data_buf;
  db_len = (uint)buf[LOG_EVENT_HEADER_LEN + Q_DB_LEN_OFFSET];
  query=data_buf + db_len + 1;
  q_len = data_len - 1 - db_len;
  *((char*)query+q_len) = 0;
}

#ifdef MYSQL_CLIENT

void Query_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char buff[40],*end;				// Enough for SET TIMESTAMP
  if (!short_form)
  {
    print_header(file);
    fprintf(file, "\tQuery\tthread_id=%lu\texec_time=%lu\terror_code=%d\n",
	    (ulong) thread_id, (ulong) exec_time, error_code);
  }

  bool same_db = 0;

  if(db && last_db)
    {
      if(!(same_db = !memcmp(last_db, db, db_len + 1)))
        memcpy(last_db, db, db_len + 1);
    }
  
  if (db && db[0] && !same_db)
    fprintf(file, "use %s;\n", db);
  end=int10_to_str((long) when, strmov(buff,"SET TIMESTAMP="),10);
  *end++=';';
  *end++='\n';
  my_fwrite(file, (byte*) buff, (uint) (end-buff),MYF(MY_NABP | MY_WME));
  my_fwrite(file, (byte*) query, q_len, MYF(MY_NABP | MY_WME));
  fprintf(file, ";\n");
}

#endif

int Query_log_event::write_data(IO_CACHE* file)
{
  if (!query) return -1;
  
  char buf[QUERY_HEADER_LEN]; 
  int4store(buf + Q_THREAD_ID_OFFSET, thread_id);
  int4store(buf + Q_EXEC_TIME_OFFSET, exec_time);
  buf[Q_DB_LEN_OFFSET] = (char)db_len;
  int2store(buf + Q_ERR_CODE_OFFSET, error_code);

  return (my_b_write(file, (byte*) buf, QUERY_HEADER_LEN) ||
	  my_b_write(file, (db) ? (byte*) db : (byte*)"", db_len + 1) ||
	  my_b_write(file, (byte*) query, q_len)) ? -1 : 0;
}

Intvar_log_event::Intvar_log_event(const char* buf):Log_event(buf)
{
  buf += LOG_EVENT_HEADER_LEN;
  type = buf[I_TYPE_OFFSET];
  val = uint8korr(buf+I_VAL_OFFSET);
}

const char* Intvar_log_event::get_var_type_name()
{
  switch(type)
  {
  case LAST_INSERT_ID_EVENT: return "LAST_INSERT_ID";
  case INSERT_ID_EVENT: return "INSERT_ID";
  default: /* impossible */ return "UNKNOWN";
  }
}

int Intvar_log_event::write_data(IO_CACHE* file)
{
  char buf[9];
  buf[I_TYPE_OFFSET] = type;
  int8store(buf + I_VAL_OFFSET, val);
  return my_b_write(file, (byte*) buf, sizeof(buf));
}

#ifdef MYSQL_CLIENT
void Intvar_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char llbuff[22];
  if(!short_form)
  {
    print_header(file);
    fprintf(file, "\tIntvar\n");
  }

  fprintf(file, "SET ");
  switch(type)
  {
  case LAST_INSERT_ID_EVENT:
    fprintf(file, "LAST_INSERT_ID = ");
    break;
  case INSERT_ID_EVENT:
    fprintf(file, "INSERT_ID = ");
    break;
  }
  fprintf(file, "%s;\n", llstr(val,llbuff));
  fflush(file);
  
}
#endif

int Load_log_event::write_data_header(IO_CACHE* file)
{
  char buf[LOAD_HEADER_LEN];
  int4store(buf + L_THREAD_ID_OFFSET, thread_id);
  int4store(buf + L_EXEC_TIME_OFFSET, exec_time);
  int4store(buf + L_SKIP_LINES_OFFSET, skip_lines);
  buf[L_TBL_LEN_OFFSET] = (char)table_name_len;
  buf[L_DB_LEN_OFFSET] = (char)db_len;
  int4store(buf + L_NUM_FIELDS_OFFSET, num_fields);
  return my_b_write(file, (byte*)buf, LOAD_HEADER_LEN);
}

int Load_log_event::write_data_body(IO_CACHE* file)
{
  if (sql_ex.write_data(file)) return 1;
  if (num_fields && fields && field_lens)
  {
    if (my_b_write(file, (byte*)field_lens, num_fields) ||
	my_b_write(file, (byte*)fields, field_block_len))
      return 1;
  }
  return (my_b_write(file, (byte*)table_name, table_name_len + 1) ||
	  my_b_write(file, (byte*)db, db_len + 1) ||
	  my_b_write(file, (byte*)fname, fname_len));
}


static bool write_str(IO_CACHE *file, char *str, byte length)
{
  return (my_b_write(file, &length, 1) ||
	  my_b_write(file, (byte*) str, (int) length));
}

int sql_ex_info::write_data(IO_CACHE* file)
{
  if (new_format())
  {
    return (write_str(file, field_term, field_term_len) ||
	    write_str(file, enclosed,   enclosed_len) ||
	    write_str(file, line_term,  line_term_len) ||
	    write_str(file, line_start, line_start_len) ||
	    write_str(file, escaped,    escaped_len) ||
	    my_b_write(file,(byte*) &opt_flags,1));
  }
  else
  {
    old_sql_ex old_ex;
    old_ex.field_term= *field_term;
    old_ex.enclosed=   *enclosed;
    old_ex.line_term=  *line_term;
    old_ex.line_start= *line_start;
    old_ex.escaped=    *escaped;
    old_ex.opt_flags=  opt_flags;
    old_ex.empty_flags=empty_flags;
    return my_b_write(file, (byte*) &old_ex, sizeof(old_ex));
  }
}

static inline int read_str(char * &buf, char *buf_end, char * &str,
			   uint8 &len)
{
  if (buf + (uint) (uchar) *buf >= buf_end)
    return 1;
  len = (uint8) *buf;
  str= buf+1;
  buf+= (uint) len+1;
  return 0;
}

char* sql_ex_info::init(char* buf,char* buf_end,bool use_new_format)
{
  cached_new_format = use_new_format;
  if (use_new_format)
  {
    empty_flags=0;
    if (read_str(buf, buf_end, field_term, field_term_len) ||
	read_str(buf, buf_end, enclosed,   enclosed_len) ||
	read_str(buf, buf_end, line_term,  line_term_len) ||
	read_str(buf, buf_end, line_start, line_start_len) ||
	read_str(buf, buf_end, escaped,	   escaped_len))
      return 0;
    opt_flags = *buf++;
  }
  else
  {
    field_term_len= enclosed_len= line_term_len= line_start_len= escaped_len=1;
    *field_term=*buf++;
    *enclosed=	*buf++;
    *line_term= *buf++;
    *line_start=*buf++;
    *escaped=	*buf++;
    opt_flags = *buf++;
    empty_flags=*buf++;
    if (empty_flags & FIELD_TERM_EMPTY)
      field_term_len=0;
    if (empty_flags & ENCLOSED_EMPTY)
      enclosed_len=0;
    if (empty_flags & LINE_TERM_EMPTY)
      line_term_len=0;
    if (empty_flags & LINE_START_EMPTY)
      line_start_len=0;
    if (empty_flags & ESCAPED_EMPTY)
      escaped_len=0;
  }
  return buf;
}


#ifndef MYSQL_CLIENT
Load_log_event::Load_log_event(THD* thd, sql_exchange* ex,
			       const char* db_arg, const char* table_name_arg,
		 List<Item>& fields_arg, enum enum_duplicates handle_dup):
    Log_event(thd),thread_id(thd->thread_id),
    num_fields(0),fields(0),field_lens(0),field_block_len(0),
    table_name(table_name_arg),
    db(db_arg),
    fname(ex->file_name)
  {
    time_t end_time;
    time(&end_time);
    exec_time = (ulong) (end_time  - thd->start_time);
    db_len = (db) ? (uint32) strlen(db) : 0;
    table_name_len = (table_name) ? (uint32) strlen(table_name) : 0;
    fname_len = (fname) ? (uint) strlen(fname) : 0;
    sql_ex.field_term = (char*) ex->field_term->ptr();
    sql_ex.field_term_len = (uint8) ex->field_term->length();
    sql_ex.enclosed = (char*) ex->enclosed->ptr();
    sql_ex.enclosed_len = (uint8) ex->enclosed->length();
    sql_ex.line_term = (char*) ex->line_term->ptr();
    sql_ex.line_term_len = (uint8) ex->line_term->length();
    sql_ex.line_start = (char*) ex->line_start->ptr();
    sql_ex.line_start_len = (uint8) ex->line_start->length();
    sql_ex.escaped = (char*) ex->escaped->ptr();
    sql_ex.escaped_len = (uint8) ex->escaped->length();
    sql_ex.opt_flags = 0;
    sql_ex.cached_new_format = -1;
    
    if(ex->dumpfile)
      sql_ex.opt_flags |= DUMPFILE_FLAG;
    if(ex->opt_enclosed)
      sql_ex.opt_flags |= OPT_ENCLOSED_FLAG;

    sql_ex.empty_flags = 0;

    switch(handle_dup)
      {
      case DUP_IGNORE: sql_ex.opt_flags |= IGNORE_FLAG; break;
      case DUP_REPLACE: sql_ex.opt_flags |= REPLACE_FLAG; break;
      case DUP_ERROR: break;	
      }


    if(!ex->field_term->length())
      sql_ex.empty_flags |= FIELD_TERM_EMPTY;
    if(!ex->enclosed->length())
      sql_ex.empty_flags |= ENCLOSED_EMPTY;
    if(!ex->line_term->length())
      sql_ex.empty_flags |= LINE_TERM_EMPTY;
    if(!ex->line_start->length())
      sql_ex.empty_flags |= LINE_START_EMPTY;
    if(!ex->escaped->length())
      sql_ex.empty_flags |= ESCAPED_EMPTY;
    
    skip_lines = ex->skip_lines;

    List_iterator<Item> li(fields_arg);
    field_lens_buf.length(0);
    fields_buf.length(0);
    Item* item;
    while((item = li++))
      {
	num_fields++;
	uchar len = (uchar) strlen(item->name);
	field_block_len += len + 1;
	fields_buf.append(item->name, len + 1);
	field_lens_buf.append((char*)&len, 1);
      }

    field_lens = (const uchar*)field_lens_buf.ptr();
    fields = fields_buf.ptr();
  }

#endif

// the caller must do buf[event_len] = 0 before he starts using the
// constructed event
Load_log_event::Load_log_event(const char* buf, int event_len):
  Log_event(buf),num_fields(0),fields(0),
  field_lens(0),field_block_len(0),
  table_name(0),db(0),fname(0)
{
  if (!event_len) // derived class, will call copy_log_event() itself
    return;
  copy_log_event(buf, event_len);
}

int Load_log_event::copy_log_event(const char *buf, ulong event_len)
{
  uint data_len;
  char* buf_end = (char*)buf + event_len;
  thread_id = uint4korr(buf + L_THREAD_ID_OFFSET + LOG_EVENT_HEADER_LEN);
  exec_time = uint4korr(buf + L_EXEC_TIME_OFFSET + LOG_EVENT_HEADER_LEN);
  skip_lines = uint4korr(buf + L_SKIP_LINES_OFFSET + LOG_EVENT_HEADER_LEN);
  table_name_len = (uint)buf[L_TBL_LEN_OFFSET + LOG_EVENT_HEADER_LEN];
  db_len = (uint)buf[L_DB_LEN_OFFSET + LOG_EVENT_HEADER_LEN];
  num_fields = uint4korr(buf + L_NUM_FIELDS_OFFSET + LOG_EVENT_HEADER_LEN);
	  
  int body_offset = get_data_body_offset();
  if ((int) event_len < body_offset)
    return 1;
  //sql_ex.init() on success returns the pointer to the first byte after
  //the sql_ex structure, which is the start of field lengths array
  if (!(field_lens=(uchar*)sql_ex.init((char*)buf + body_offset,
		  buf_end,
		  buf[EVENT_TYPE_OFFSET] != LOAD_EVENT)))
    return 1;
  
  data_len = event_len - body_offset;
  if (num_fields > data_len) // simple sanity check against corruption
    return 1;
  uint i;
  for (i = 0; i < num_fields; i++)
  {
    field_block_len += (uint)field_lens[i] + 1;
  }
  fields = (char*)field_lens + num_fields;
  table_name  = fields + field_block_len;
  db = table_name + table_name_len + 1;
  fname = db + db_len + 1;
  int type_code = get_type_code();
  fname_len = strlen(fname);
  // null termination is accomplished by the caller doing buf[event_len]=0
  return 0;
}

#ifdef MYSQL_CLIENT

void Load_log_event::print(FILE* file, bool short_form, char* last_db)
{
  if (!short_form)
  {
    print_header(file);
    fprintf(file, "\tQuery\tthread_id=%ld\texec_time=%ld\n",
	    thread_id, exec_time);
  }

  bool same_db = 0;

  if(db && last_db)
    {
      if(!(same_db = !memcmp(last_db, db, db_len + 1)))
        memcpy(last_db, db, db_len + 1);
    }
  
  if(db && db[0] && !same_db)
    fprintf(file, "use %s;\n", db);

  fprintf(file, "LOAD DATA INFILE '%-*s' ", fname_len, fname);

  if(sql_ex.opt_flags && REPLACE_FLAG )
    fprintf(file," REPLACE ");
  else if(sql_ex.opt_flags && IGNORE_FLAG )
    fprintf(file," IGNORE ");
  
  fprintf(file, "INTO TABLE %s ", table_name);
  if(sql_ex.field_term)
  {
    fprintf(file, " FIELDS TERMINATED BY ");
    pretty_print_str(file, sql_ex.field_term, sql_ex.field_term_len);
  }

  if(sql_ex.enclosed)
  {
    if(sql_ex.opt_flags && OPT_ENCLOSED_FLAG )
      fprintf(file," OPTIONALLY ");
    fprintf(file, " ENCLOSED BY ");
    pretty_print_str(file, sql_ex.enclosed, sql_ex.enclosed_len);
  }
     
  if (sql_ex.escaped)
  {
    fprintf(file, " ESCAPED BY ");
    pretty_print_str(file, sql_ex.escaped, sql_ex.escaped_len);
  }
     
  if (sql_ex.line_term)
  {
    fprintf(file," LINES TERMINATED BY ");
    pretty_print_str(file, sql_ex.line_term, sql_ex.line_term_len);
  }

  if (sql_ex.line_start)
  {
    fprintf(file," LINES STARTING BY ");
    pretty_print_str(file, sql_ex.line_start, sql_ex.line_start_len);
  }
     
  if((int)skip_lines > 0)
    fprintf(file, " IGNORE %ld LINES ", (long) skip_lines);

  if (num_fields)
  {
    uint i;
    const char* field = fields;
    fprintf( file, " (");
    for(i = 0; i < num_fields; i++)
    {
      if(i)
	fputc(',', file);
      fprintf(file, field);
	  
      field += field_lens[i]  + 1;
    }
    fputc(')', file);
  }

  fprintf(file, ";\n");
}

#endif /* #ifdef MYSQL_CLIENT */

#ifndef MYSQL_CLIENT

void Log_event::set_log_seq(THD* thd, MYSQL_LOG* log)
 {
   log_seq = (thd && thd->log_seq) ? thd->log_seq++ : log->log_seq++;
 }


void Load_log_event::set_fields(List<Item> &fields)
{
  uint i;
  const char* field = this->fields;
  for(i = 0; i < num_fields; i++)
    {
      fields.push_back(new Item_field(db, table_name, field));	  
      field += field_lens[i]  + 1;
    }
  
}

Slave_log_event::Slave_log_event(THD* thd_arg,struct st_master_info* mi):
  Log_event(thd_arg),mem_pool(0),master_host(0)
{
  if(!mi->inited)
    return;
  pthread_mutex_lock(&mi->lock);
  master_host_len = strlen(mi->host);
  master_log_len = strlen(mi->log_file_name);
  // on OOM, just do not initialize the structure and print the error
  if((mem_pool = (char*)my_malloc(get_data_size() + 1,
				  MYF(MY_WME))))
  {
    master_host = mem_pool + SL_MASTER_HOST_OFFSET ;
    memcpy(master_host, mi->host, master_host_len + 1);
    master_log = master_host + master_host_len + 1;
    memcpy(master_log, mi->log_file_name, master_log_len + 1);
    master_port = mi->port;
    master_pos = mi->pos;
  }
  else
    sql_print_error("Out of memory while recording slave event");
  pthread_mutex_unlock(&mi->lock);
}


#endif


Slave_log_event::~Slave_log_event()
{
  my_free(mem_pool, MYF(MY_ALLOW_ZERO_PTR));
}

#ifdef MYSQL_CLIENT

void Slave_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char llbuff[22];
  if(short_form)
    return;
  print_header(file);
  fputc('\n', file);
  fprintf(file, "Slave: master_host='%s' master_port=%d \
 master_log=%s master_pos=%s\n", master_host, master_port, master_log,
	  llstr(master_pos, llbuff));
}

#endif

int Slave_log_event::get_data_size()
{
  return master_host_len + master_log_len + 1 + SL_MASTER_HOST_OFFSET;
}

int Slave_log_event::write_data(IO_CACHE* file)
{
  int8store(mem_pool + SL_MASTER_POS_OFFSET, master_pos);
  int2store(mem_pool + SL_MASTER_PORT_OFFSET, master_port);
  // log and host are already there
  return my_b_write(file, (byte*)mem_pool, get_data_size());
}

void Slave_log_event::init_from_mem_pool(int data_size)
{
  master_pos = uint8korr(mem_pool + SL_MASTER_POS_OFFSET);
  master_port = uint2korr(mem_pool + SL_MASTER_PORT_OFFSET);
  master_host = mem_pool + SL_MASTER_HOST_OFFSET;
  master_host_len = strlen(master_host);
  // safety
  master_log = master_host + master_host_len + 1;
  if(master_log > mem_pool + data_size)
  {
    master_host = 0;
    return;
  }
  master_log_len = strlen(master_log);
}

Slave_log_event::Slave_log_event(const char* buf, int event_len):
  Log_event(buf),mem_pool(0),master_host(0)
{
  event_len -= LOG_EVENT_HEADER_LEN;
  if(event_len < 0)
    return;
  if(!(mem_pool = (char*)my_malloc(event_len + 1, MYF(MY_WME))))
    return;
  memcpy(mem_pool, buf + LOG_EVENT_HEADER_LEN, event_len);
  mem_pool[event_len] = 0;
  init_from_mem_pool(event_len);
}

#ifndef MYSQL_CLIENT
Create_file_log_event::Create_file_log_event(THD* thd_arg, sql_exchange* ex,
		 const char* db_arg, const char* table_name_arg,
		 List<Item>& fields_arg, enum enum_duplicates handle_dup,
			char* block_arg, uint block_len_arg):
  Load_log_event(thd_arg,ex,db_arg,table_name_arg,fields_arg,handle_dup),
 fake_base(0),block(block_arg),block_len(block_len_arg),
  file_id(thd_arg->file_id = mysql_bin_log.next_file_id())
{
  sql_ex.force_new_format();
}
#endif

int Create_file_log_event::write_data_body(IO_CACHE* file)
{
  int res;
  if ((res = Load_log_event::write_data_body(file)) || fake_base)
    return res;
  return (my_b_write(file, (byte*) "", 1) ||
	  my_b_write(file, (byte*) block, block_len));
}

int Create_file_log_event::write_data_header(IO_CACHE* file)
{
  int res;
  if ((res = Load_log_event::write_data_header(file)) || fake_base)
    return res;
  byte buf[CREATE_FILE_HEADER_LEN];
  int4store(buf + CF_FILE_ID_OFFSET, file_id);
  return my_b_write(file, buf, CREATE_FILE_HEADER_LEN);
}

int Create_file_log_event::write_base(IO_CACHE* file)
{
  int res;
  fake_base = 1; // pretend we are Load event
  res = write(file);
  fake_base = 0;
  return res;
}

Create_file_log_event::Create_file_log_event(const char* buf, int len):
  Load_log_event(buf,0),fake_base(0),block(0)
{
  int block_offset;
  if (copy_log_event(buf,len))
    return;
  file_id = uint4korr(buf + LOG_EVENT_HEADER_LEN +
		      + LOAD_HEADER_LEN + CF_FILE_ID_OFFSET);
  block_offset = LOG_EVENT_HEADER_LEN + Load_log_event::get_data_size() +
    CREATE_FILE_HEADER_LEN + 1; // 1 for \0 terminating fname  
  if (len < block_offset)
    return;
  block = (char*)buf + block_offset;
  block_len = len - block_offset;
}


#ifdef MYSQL_CLIENT
void Create_file_log_event::print(FILE* file, bool short_form,
				  char* last_db)
{
  if (short_form)
    return;
  Load_log_event::print(file, 1, last_db);
  fprintf(file, " file_id=%d, block_len=%d\n", file_id, block_len);
}
#endif

#ifndef MYSQL_CLIENT
void Create_file_log_event::pack_info(String* packet)
{
  char buf1[256];
  String tmp(buf1, sizeof(buf1));
  tmp.length(0);
  char buf[22];
  tmp.append("db=");
  tmp.append(db, db_len);
  tmp.append(";table=");
  tmp.append(table_name, table_name_len);
  tmp.append(";file_id=");
  tmp.append(llstr(file_id,buf));
  tmp.append(";block_len=");
  tmp.append(llstr(block_len,buf));
  net_store_data(packet, (char*)tmp.ptr(), tmp.length());
}
#endif  

#ifndef MYSQL_CLIENT  
Append_block_log_event::Append_block_log_event(THD* thd_arg, char* block_arg,
					       uint block_len_arg):
  Log_event(thd_arg), block(block_arg),block_len(block_len_arg),
  file_id(thd_arg->file_id)
{
}
#endif  
  
Append_block_log_event::Append_block_log_event(const char* buf, int len):
  Log_event(buf),block(0)
{
  if((uint)len < APPEND_BLOCK_EVENT_OVERHEAD)
    return;
  file_id = uint4korr(buf + LOG_EVENT_HEADER_LEN + AB_FILE_ID_OFFSET);
  block = (char*)buf + APPEND_BLOCK_EVENT_OVERHEAD;
  block_len = len - APPEND_BLOCK_EVENT_OVERHEAD;
}

int Append_block_log_event::write_data(IO_CACHE* file)
{
  byte buf[APPEND_BLOCK_HEADER_LEN];
  int4store(buf + AB_FILE_ID_OFFSET, file_id);
  return (my_b_write(file, buf, APPEND_BLOCK_HEADER_LEN) ||
	  my_b_write(file, (byte*) block, block_len));
}

#ifdef MYSQL_CLIENT  
void Append_block_log_event::print(FILE* file, bool short_form,
				   char* last_db)
{
  if (short_form)
    return;
  print_header(file);
  fputc('\n', file);
  fprintf(file, "#Append_block: file_id=%d, block_len=%d\n",
	  file_id, block_len);
}
#endif  
#ifndef MYSQL_CLIENT
void Append_block_log_event::pack_info(String* packet)
{
  char buf1[256];
  String tmp(buf1, sizeof(buf1));
  tmp.length(0);
  char buf[22];
  tmp.append(";file_id=");
  tmp.append(llstr(file_id,buf));
  tmp.append(";block_len=");
  tmp.append(llstr(block_len,buf));
  net_store_data(packet, (char*)tmp.ptr(), tmp.length());
}
#endif  

#ifndef MYSQL_CLIENT  
Delete_file_log_event::Delete_file_log_event(THD* thd_arg):
  Log_event(thd_arg),file_id(thd_arg->file_id)
{
}
#endif  

Delete_file_log_event::Delete_file_log_event(const char* buf, int len):
  Log_event(buf),file_id(0)
{
  if((uint)len < DELETE_FILE_EVENT_OVERHEAD)
    return;
  file_id = uint4korr(buf + LOG_EVENT_HEADER_LEN + AB_FILE_ID_OFFSET);
}

int Delete_file_log_event::write_data(IO_CACHE* file)
{
 byte buf[DELETE_FILE_HEADER_LEN];
 int4store(buf + DF_FILE_ID_OFFSET, file_id);
 return my_b_write(file, buf, DELETE_FILE_HEADER_LEN);
}

#ifdef MYSQL_CLIENT  
void Delete_file_log_event::print(FILE* file, bool short_form,
				  char* last_db)
{
  if (short_form)
    return;
  print_header(file);
  fputc('\n', file);
  fprintf(file, "#Delete_file: file_id=%d\n",
	  file_id);
}
#endif  
#ifndef MYSQL_CLIENT
void Delete_file_log_event::pack_info(String* packet)
{
  char buf1[256];
  String tmp(buf1, sizeof(buf1));
  tmp.length(0);
  char buf[22];
  tmp.append(";file_id=");
  tmp.append(llstr(file_id,buf));
  net_store_data(packet, (char*)tmp.ptr(), tmp.length());
}
#endif  

#ifndef MYSQL_CLIENT  
Execute_load_log_event::Execute_load_log_event(THD* thd_arg):
  Log_event(thd_arg),file_id(thd_arg->file_id)
{
}
#endif  
  
Execute_load_log_event::Execute_load_log_event(const char* buf,int len):
  Log_event(buf),file_id(0)
{
  if((uint)len < EXEC_LOAD_EVENT_OVERHEAD)
    return;
  file_id = uint4korr(buf + LOG_EVENT_HEADER_LEN + EL_FILE_ID_OFFSET);
}

int Execute_load_log_event::write_data(IO_CACHE* file)
{
  byte buf[EXEC_LOAD_HEADER_LEN];
  int4store(buf + EL_FILE_ID_OFFSET, file_id);
  return my_b_write(file, buf, EXEC_LOAD_HEADER_LEN);
}

#ifdef MYSQL_CLIENT  
void Execute_load_log_event::print(FILE* file, bool short_form,
				   char* last_db)
{
  if (short_form)
    return;
  print_header(file);
  fputc('\n', file);
  fprintf(file, "#Exec_load: file_id=%d\n",
	  file_id);
}
#endif  
#ifndef MYSQL_CLIENT
void Execute_load_log_event::pack_info(String* packet)
{
  char buf1[256];
  String tmp(buf1, sizeof(buf1));
  tmp.length(0);
  char buf[22];
  tmp.append(";file_id=");
  tmp.append(llstr(file_id,buf));
  net_store_data(packet, (char*)tmp.ptr(), tmp.length());
}
#endif

#ifndef MYSQL_CLIENT
int Query_log_event::exec_event(struct st_master_info* mi)
{
  int expected_error,actual_error = 0;
  init_sql_alloc(&thd->mem_root, 8192,0);
  thd->db = rewrite_db((char*)db);
  if (db_ok(thd->db, replicate_do_db, replicate_ignore_db))
  {
    thd->query = (char*)query;
    thd->set_time((time_t)when);
    thd->current_tablenr = 0;
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    thd->query_id = query_id++;
    VOID(pthread_mutex_unlock(&LOCK_thread_count));
    thd->query_error = 0;			// clear error
    thd->net.last_errno = 0;
    thd->net.last_error[0] = 0;
    thd->slave_proxy_id = thread_id;	// for temp tables
	
    // sanity check to make sure the master did not get a really bad
    // error on the query
    if (!check_expected_error(thd, (expected_error = error_code)))
    {
      mysql_parse(thd, thd->query, q_len);
      if (expected_error !=
	  (actual_error = thd->net.last_errno) && expected_error)
      {
	const char* errmsg = "Slave: did not get the expected error\
 running query from master - expected: '%s' (%d), got '%s' (%d)"; 
	sql_print_error(errmsg, ER_SAFE(expected_error),
			expected_error,
			actual_error ? thd->net.last_error: "no error",
			actual_error);
	thd->query_error = 1;
      }
      else if (expected_error == actual_error)
      {
	thd->query_error = 0;
	*last_slave_error = 0;
	last_slave_errno = 0;
      }
    }
    else
    {
      // master could be inconsistent, abort and tell DBA to check/fix it
      thd->db = thd->query = 0;
      thd->convert_set = 0;
      close_thread_tables(thd);
      free_root(&thd->mem_root,0);
      return 1;
    }
  }
  thd->db = 0;				// prevent db from being freed
  thd->query = 0;				// just to be sure
  // assume no convert for next query unless set explictly
  thd->convert_set = 0;
  close_thread_tables(thd);
      
  if (thd->query_error || thd->fatal_error)
  {
    slave_print_error(actual_error, "error '%s' on query '%s'",
		actual_error ? thd->net.last_error :
		"unexpected success or fatal error", query);
    free_root(&thd->mem_root,0);
    return 1;
  }
  free_root(&thd->mem_root,0);
  return Log_event::exec_event(mi); 
}

int Load_log_event::exec_event(NET* net, struct st_master_info* mi)
{
  init_sql_alloc(&thd->mem_root, 8192,0);
  thd->db = rewrite_db((char*)db);
  thd->query = 0;
  thd->query_error = 0;
	    
  if(db_ok(thd->db, replicate_do_db, replicate_ignore_db))
  {
    thd->set_time((time_t)when);
    thd->current_tablenr = 0;
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    thd->query_id = query_id++;
    VOID(pthread_mutex_unlock(&LOCK_thread_count));

    TABLE_LIST tables;
    bzero((char*) &tables,sizeof(tables));
    tables.db = thd->db;
    tables.name = tables.real_name = (char*)table_name;
    tables.lock_type = TL_WRITE;
    // the table will be opened in mysql_load    
    if(table_rules_on && !tables_ok(thd, &tables))
    {
      if (net)
        skip_load_data_infile(net);
    }
    else
    {
      char llbuff[22];
      enum enum_duplicates handle_dup = DUP_IGNORE;
      if(sql_ex.opt_flags && REPLACE_FLAG)
	handle_dup = DUP_REPLACE;
      sql_exchange ex((char*)fname, sql_ex.opt_flags &&
		      DUMPFILE_FLAG );
      String field_term(sql_ex.field_term,sql_ex.field_term_len);
      String enclosed(sql_ex.enclosed,sql_ex.enclosed_len);
      String line_term(sql_ex.line_term,sql_ex.line_term_len);
      String line_start(sql_ex.line_start,sql_ex.line_start_len);
      String escaped(sql_ex.escaped,sql_ex.escaped_len);
	    
      ex.opt_enclosed = (sql_ex.opt_flags & OPT_ENCLOSED_FLAG);
      if (sql_ex.empty_flags & FIELD_TERM_EMPTY)
	ex.field_term->length(0);

      ex.skip_lines = skip_lines;
      List<Item> fields;
      set_fields(fields);
      thd->slave_proxy_id = thd->thread_id;
      if (net)
      {
	// mysql_load will use thd->net to read the file
	thd->net.vio = net->vio;
	// make sure the client does not get confused
	// about the packet sequence
	thd->net.pkt_nr = net->pkt_nr;
      }
      if(mysql_load(thd, &ex, &tables, fields, handle_dup, net != 0,
		    TL_WRITE))
	thd->query_error = 1;
      if(thd->cuted_fields)
	sql_print_error("Slave: load data infile at position %s in log \
'%s' produced %d warning(s)", llstr(mi->pos,llbuff), RPL_LOG_NAME,
			thd->cuted_fields );
      if(net)
        net->pkt_nr = thd->net.pkt_nr;
    }
  }
  else
  {
    // we will just ask the master to send us /dev/null if we do not
    // want to load the data
    if (net)
      skip_load_data_infile(net);
  }
	    
  thd->net.vio = 0; 
  thd->db = 0;// prevent db from being freed
  close_thread_tables(thd);
  if(thd->query_error)
  {
    int sql_error = thd->net.last_errno;
    if(!sql_error)
      sql_error = ER_UNKNOWN_ERROR;
		
    slave_print_error(sql_error, "Slave: Error '%s' running load data infile ",
		    ER_SAFE(sql_error));
    free_root(&thd->mem_root,0);
    return 1;
  }
  free_root(&thd->mem_root,0);
	    
  if(thd->fatal_error)
  {
    sql_print_error("Slave: Fatal error running LOAD DATA INFILE ");
    return 1;
  }

  return Log_event::exec_event(mi); 
}

int Start_log_event::exec_event(struct st_master_info* mi)
{
#ifdef TO_BE_DELETED
  /*
    We can't close temporary files or cleanup the tmpdir here, becasue
    someone may have just rotated the logs on the master.
    We should only do this cleanup when we know the master restarted.
  */
  close_temporary_tables(thd);
  cleanup_load_tmpdir();
#endif
  return Log_event::exec_event(mi);
}

int Stop_log_event::exec_event(struct st_master_info* mi)
{
  if (mi->pos > 4) // stop event should be ignored after rotate event
  {
    close_temporary_tables(thd);
    cleanup_load_tmpdir();
    mi->inc_pos(get_event_len(), log_seq);
    flush_master_info(mi);
  }
  thd->log_seq = 0;
  return 0;
}

int Rotate_log_event::exec_event(struct st_master_info* mi)
{
  bool rotate_binlog = 0, write_slave_event = 0;
  char* log_name = mi->log_file_name;
  pthread_mutex_lock(&mi->lock);
      
  // rotate local binlog only if the name of remote has changed
  if (!*log_name || !(log_name[ident_len] == 0 &&
		      !memcmp(log_name, new_log_ident, ident_len)))
  {
    write_slave_event = (!(flags & LOG_EVENT_FORCED_ROTATE_F)
			 && mysql_bin_log.is_open());
    rotate_binlog = (*log_name && write_slave_event);
    memcpy(log_name, new_log_ident,ident_len );
    log_name[ident_len] = 0;
  }
  mi->pos = pos; 
  mi->last_log_seq = log_seq;
#ifndef DBUG_OFF
  if (abort_slave_event_count)
    ++events_till_abort;
#endif
  if (rotate_binlog)
  {
    mysql_bin_log.new_file();
    mi->last_log_seq = 0;
  }
  pthread_cond_broadcast(&mi->cond);
  pthread_mutex_unlock(&mi->lock);
  flush_master_info(mi);
      
  if (write_slave_event)
  {
    Slave_log_event s(thd, mi);
    if (s.master_host)
    {
      s.set_log_seq(0, &mysql_bin_log);
      s.server_id = ::server_id;
      mysql_bin_log.write(&s);
    }
  }
  thd->log_seq = 0;
  return 0;
}

int Intvar_log_event::exec_event(struct st_master_info* mi)
{
  switch(type)
  {
  case LAST_INSERT_ID_EVENT:
    thd->last_insert_id_used = 1;
    thd->last_insert_id = val;
    break;
  case INSERT_ID_EVENT:
    thd->next_insert_id = val;
    break;
  }
  mi->inc_pending(get_event_len());
  return 0;
}

int Slave_log_event::exec_event(struct st_master_info* mi)
{
  if(mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  return Log_event::exec_event(mi);
}

int Create_file_log_event::exec_event(struct st_master_info* mi)
{
  char fname_buf[FN_REFLEN+10];
  char *p;
  int fd = -1;
  IO_CACHE file;
  int error = 1;

  bzero((char*)&file, sizeof(file));
  p = slave_load_file_stem(fname_buf, file_id, server_id);
  strmov(p, ".info");			// strmov takes less code than memcpy
  if ((fd = my_open(fname_buf, O_WRONLY|O_CREAT|O_BINARY|O_TRUNC,
		    MYF(MY_WME))) < 0 ||
      init_io_cache(&file, fd, IO_SIZE, WRITE_CACHE, (my_off_t)0, 0,
		    MYF(MY_WME|MY_NABP)))
  {
    slave_print_error(my_errno, "Could not open file '%s'", fname_buf);
    goto err;
  }
  
  // a trick to avoid allocating another buffer
  strmov(p, ".data");
  fname = fname_buf;
  fname_len = (uint)(p-fname) + 5;
  if (write_base(&file))
  {
    strmov(p, ".info"); // to have it right in the error message
    slave_print_error(my_errno, "Could not write to file '%s'", fname_buf);
    goto err;
  }
  end_io_cache(&file);
  my_close(fd, MYF(0));
  
  // fname_buf now already has .data, not .info, because we did our trick
  if ((fd = my_open(fname_buf, O_WRONLY|O_CREAT|O_BINARY|O_TRUNC,
		    MYF(MY_WME))) < 0)
  {
    slave_print_error(my_errno, "Could not open file '%s'", fname_buf);
    goto err;
  }
  if (my_write(fd, (byte*) block, block_len, MYF(MY_WME+MY_NABP)))
  {
    slave_print_error(my_errno, "Write to '%s' failed", fname_buf);
    goto err;
  }
  if (mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  error=0;
err:
  if (error)
    end_io_cache(&file);
  if (fd >= 0)
    my_close(fd, MYF(0));
  return error ? 1 : Log_event::exec_event(mi);
}

int Delete_file_log_event::exec_event(struct st_master_info* mi)
{
  char fname[FN_REFLEN+10];
  char* p;
  p = slave_load_file_stem(fname, file_id, server_id);
  memcpy(p, ".data", 6);
  (void)my_delete(fname, MYF(MY_WME));
  memcpy(p, ".info", 6);
  (void)my_delete(fname, MYF(MY_WME));
  if (mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  return Log_event::exec_event(mi);
}

int Append_block_log_event::exec_event(struct st_master_info* mi)
{
  char fname[FN_REFLEN+10];
  char* p;
  int fd = -1;
  int error = 1;
  p = slave_load_file_stem(fname, file_id, server_id);
  memcpy(p, ".data", 6);
  if ((fd = my_open(fname, O_WRONLY|O_APPEND|O_BINARY, MYF(MY_WME))) < 0)
  {
    slave_print_error(my_errno, "Could not open file '%s'", fname);
    goto err;
  }
  if (my_write(fd, (byte*) block, block_len, MYF(MY_WME+MY_NABP)))
  {
    slave_print_error(my_errno, "Write to '%s' failed", fname);
    goto err;
  }
  if (mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  error=0;
err:
  if (fd >= 0)
    my_close(fd, MYF(0));
  return error ? error : Log_event::exec_event(mi);
}

int Execute_load_log_event::exec_event(struct st_master_info* mi)
{
  char fname[FN_REFLEN+10];
  char* p;
  int fd = -1;
  int error = 1;
  ulong save_options;
  IO_CACHE file;
  Load_log_event* lev = 0;
  p = slave_load_file_stem(fname, file_id, server_id);
  memcpy(p, ".info", 6);
  bzero((char*)&file, sizeof(file));
  if ((fd = my_open(fname, O_RDONLY|O_BINARY, MYF(MY_WME))) < 0 ||
      init_io_cache(&file, fd, IO_SIZE, READ_CACHE, (my_off_t)0, 0,
		    MYF(MY_WME|MY_NABP)))
  {
    slave_print_error(my_errno, "Could not open file '%s'", fname);
    goto err;
  }
  if (!(lev = (Load_log_event*)Log_event::read_log_event(&file,0))
      || lev->get_type_code() != NEW_LOAD_EVENT)
  {
    slave_print_error(0, "File '%s' appears corrupted", fname);
    goto err;
  }
  // we want to disable binary logging in slave thread
  // because we need the file events to appear in the same order
  // as they do on the master relative to other events, so that we
  // can preserve ascending order of log sequence numbers - needed
  // to handle failover 
  save_options = thd->options;
  thd->options &= ~ (ulong) (OPTION_BIN_LOG);
  lev->thd = thd;
  if (lev->exec_event(0,0))
  {
    slave_print_error(my_errno, "Failed executing load from '%s'", fname);
    thd->options = save_options;
    goto err;
  }
  thd->options = save_options;
  (void)my_delete(fname, MYF(MY_WME));
  memcpy(p, ".data", 6);
  (void)my_delete(fname, MYF(MY_WME));
  if (mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  error = 0;
err:
  delete lev;
  end_io_cache(&file);
  if (fd >= 0)
    my_close(fd, MYF(0));
  return error ? error : Log_event::exec_event(mi);
}


#endif